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Note 11 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 12, 2018
Stock Repurchased and Retired During Period, Shares (in shares) | [1],[2] |  |  |  |  | 683,000 | 1,087,000 | 1,853,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  | $ 5,700 | $ 4,700 | $ 7,800 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  |  |  |  | 0 | $ 600 | $ 1,200 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | 0 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 4,800 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 1 year 7 months 6 days |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 1,400 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 1 year 9 months 18 days |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Evaluation of Performance Conditions Period (Year) |  |  |  |  |  | 3 years |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Awards if Only Threshhold Performance Met, Percentage |  |  |  |  |  | 50.00% |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Awards for Target Performance, Percentage |  |  |  |  |  | 100.00% |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Awards for Maximum Performance, Percentage |  |  |  |  |  | 200.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  |  | 364,810 | 395,964 | 486,805 |  |  |  |
Shares Issued Per Unit (in shares) |  |  | 1.53 | 1.67 | 1.57 |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  | 126,465 | 125,004 | 149,268 |  |  |  |
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings (in shares) |  |  | 238,345 | 270,960 | 337,537 |  |  |  |
Shares to be Issued to Settle PSUs (in shares) |  |  |  |  |  | 600,000 |  |  |
Career Shares [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 1,200 |  |  |
Career Shares [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Award Eligibility Minimum Age (Year) |  |  |  |  |  | 55 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year) |  |  |  |  |  | 10 years |  |  |
Career Shares [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Service Period (Year) |  |  |  |  |  | 10 years |  |  |
Career Shares [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Service Period (Year) |  |  |  |  |  | 15 years |  |  |
Career Shares [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Service Period (Year) |  |  |  |  |  | 20 years |  |  |
The 2020 Plan [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Expiration of Plan (Year) |  | 10 years |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  | 3,300,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  | 7,600,000 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  |  | 11,300,000 |  |  |
The 2020 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |  |
The 2018 Plan [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  | $ 61,400 |  |  |
[1] | All shares repurchased have been retired and constitute authorized but unissued shares.
[2] | Shares repurchased reflect repurchases settled during the twelve months ended December 31, 2020, 2019 and 2018. These amounts exclude repurchases, if any, traded but not yet settled on or before December 31, 2020, 2019 and 2018.

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